According to Fender, the leading manufacturer of Jazz and Precision basses, the necks of Jazz and Precision basses are not interchangeable. This is due to several design differences between the two types of basses.
One significant difference is the scale length of the two basses. The Precision bass has a longer scale length of 34 inches, while the Jazz bass has a shorter scale length of 34 inches. This difference in scale length affects the distance between frets, and consequently, the placement of the frets on the neck.
Another difference between the two basses is the shape of the neck. The Precision bass has a thicker, more substantial neck, while the Jazz bass has a slimmer, more contoured neck. The neck shapes affect the feel and playability of the instrument and are a significant factor in determining which bass is best suited to a particular player’s preferences.
Moreover, the Jazz and Precision basses have different neck pocket sizes, which also make them non-interchangeable. The neck pocket is the cavity in the body of the bass where the neck attaches to the body. The size and shape of the neck pocket must match the neck precisely to ensure a secure and stable connection between the neck and body.
In conclusion, the necks of Jazz and Precision basses are not interchangeable due to significant design differences between the two types of basses. These differences include scale length, neck shape, and neck pocket size. As such, it is essential to choose the right bass for your playing style and preferences to ensure optimal performance and playability.
Source: Fender website.
